Global Internet Ad Spend to Climb 28 Percent in '07 - Global Internet ad spending will grow by 28.2 percent in 2007, according to a forecast report courtesy of ZenithOptimedia. The report finds the Internet's share of ad spending will increase from 5.8 percent in 2006 to 7 percent in 2007, and will eventually climb to 8.6 percent in 2009.

By comparison, global ad spending in all channels will collectively grow by only 3.9 percent. Online ad spending is expected to hit $31.3 billion this year. It will hit $42.7 billion in 2009, according to ZenithOptimedia.